Lina Fu, Jingwen Yang, Yanling Li, Zonghua Zhang, Nan Gao, Zhaozong Meng, Feng Gao, Xiangqian Jiang. Binary Fringe Defocused Projection Technology: A Review[J]. Laser & Optoelectronics Progress, 2022, 59(14): 1415011
- Laser & Optoelectronics Progress
- Vol. 59, Issue 14, 1415011 (2022)
Fig. 1. Principle of defocusing projection. (a) Defocusing imaging; (b) defocusing area division
Fig. 2. Binary fringe with different defocusing level. (a) Original fringe; (b)‒(d) binary images with increasing defocusing level
Fig. 3. Property of square wave signal. (a) Harmonic distribution; (b) harmonic attenuation
Fig. 4. Fliter with different Guassion kernels
Fig. 5. Comparison before and after filtering. (a) Pre-defocus signal; (b) defocused signal; (c) frequency spectrum of Fig.5 (a); (d) frequency spectrum of Fig.5 (b)
Fig. 6. Schematic of TRP chip[39]. (a) -17°; (b) +17°
Fig. 7. Frequency-spectrum diagram of SPWM fringe with different modulation frequency. (a) k=9; (b) k=13
Fig. 8. Bayer dithering technique for sinusoidal image[81]. (a) Original sinusoidal image; (b) image obtained by Bayer dithering for Fig.8(a)
Fig. 9. Framework of Bayer dithering optimization algorithm[88]
Fig. 10. Schematic of S-SD method[97]. (a) Scanning sequence of S-SD; (b) error diffusion
Fig. 11. Combining binary fringe projection process[106]
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Table 1. Sensitivity of N-step phase shifting algorithm to harmonics
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Table 2. Performance comparison of different fringe modulation methods
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